GAMMA-AMINOBUTYRIC ACID-INDUCED RESPONSE IN ACUTELY ISOLATED NUCLEUS-SOLITARII NEURONS OF THE RAT

被引：38

作者：

NAKAGAWA, T ^{[1
]}

WAKAMORI, M ^{[1
]}

SHIRASAKI, T ^{[1
]}

NAKAYE, T ^{[1
]}

AKAIKE, N ^{[1
]}

机构：

[1] TOHOKU UNIV,SCH MED,DEPT NEUROPHYSIOL,SENDAI,MIYAGI 980,JAPAN

来源：

AMERICAN JOURNAL OF PHYSIOLOGY | 1991年 / 260卷 / 04期

关键词：

NUCLEUS TRACTUS SOLITARIUS; DISSOCIATED NEURON; PENTOBARBITAL; CHLORIDE CURRENT;

D O I：

10.1152/ajpcell.1991.260.4.C745

中图分类号：

Q4 [生理学];

学科分类号：

071003 ;

摘要：

The gamma-aminobutyric acid (GABA)-induced macroscopic Cl- current (I(Cl)) was investigated in acutely isolated nucleus tractus solitarii (NTS) neurons by a conventional patch-clamp technique combined with a rapid drug application method. The GABA- and muscimol-induced I(Cl) increased in a concentration-dependent manner. The reversal potentials were close to the Cl- equilibrium potential. Pentobarbital sodium (PB) itself elicited a current. Bicuculline (BIC), strychnine (STR), picrotoxin, benzylpenicillin (PCG), Cd2+, and Zn2+ suppressed the GABA response in a concentration-dependent manner. Both BIC and STR shifted the concentration-response curve for GABA response to the right, whereas PCG suppressed the maximum response without affecting the threshold, indicating that BIC and STR antagonized competitively and PCG noncompetitively. The inhibitory action of PCG on GABA response was in a highly voltage-dependent manner. PB shifted the concentration-response curve for GABA response to the left. The augmentatory effect of PB was voltage dependent.

引用

页码：C745 / C749

页数：5

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